lucene第一个小程序

最新推荐文章于 2025-11-23 22:15:59 发布

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#索引 #lucene

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本文介绍如何使用Lucene创建文档索引，并演示了索引的添加过程。此外，还探讨了删除索引的方法，但注意到直接通过IndexReader进行删除操作会遇到权限问题。

建立索引

package dsa;

import java.io.File;
import java.io.IOException;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.Field.Index;
import org.apache.lucene.document.Field.Store;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;
import org.apache.lucene.util.Version;

public class Test {

    public static void main(String[] args) throws Exception {
        String [] ids={"1","2","3"};
        String [] names={"zhangsan","lisi","wangwu"};
        String [] address={"beijing","shanghai","hebei"};

        Analyzer analyzer=new StandardAnalyzer(Version.LUCENE_20);

        String indexDir ="d://haha";
        File file=new File(indexDir);

        Directory directory=FSDirectory.open(file);

        IndexWriter writer=new IndexWriter(directory, analyzer, true, IndexWriter.MaxFieldLength.LIMITED);

        for (int i = 0; i < ids.length; i++) {

            Document document=new Document();
            document.add(new Field("id", ids[i], Field.Store.YES , Index.ANALYZED));
            document.add(new Field("names", names[i], Field.Store.YES , Index.NO));
            document.add(new Field("address", address[i], Field.Store.YES , Index.ANALYZED));

            writer.addDocument(document);

        }
        writer.optimize();
        writer.close();


    }

}

测试删除某条索引

package dsa;

import java.io.File;
import java.io.IOException;

import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.Term;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;

public class DeleteTest {
    public static void main(String[] args) throws Exception {

        String indexDir ="d://haha";
        Directory directory=FSDirectory.open(new File(indexDir));
        IndexReader reader=IndexReader.open(directory);
        System.out.println(reader.maxDoc());//查看当前document最大序号
        //reader.deleteDocument(0);//根据序号删除   没有删除权限？？？

        System.out.println(reader.maxDoc());
    //  System.out.println(reader.deleteDocuments(new Term("id", "2")));没有删除权限？？？
        System.out.println(reader.numDocs());
        reader.close();
        directory.close();

    }
}